ANSI IEEE Std 91-1984.pdf

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ANSI IEEE Std 91-1984，标准，数字，逻辑，门电路，国际，符号

ANSI/IEEE Std 91-1984

IEEE Standard Graphic Symbols for

Logic Functions

(Including and incorporating IEEE Std 91a-1991, Supplement to IEEE

Standard Graphic Symbols for Logic Functions)

Sponsor

IEEE Standards Coordinating Committee 11,

Graphic Symbols and Designations

ANSI/IEEE Std 91-1984

Approved 17 September 1981, IEEE Standards Board

Approved 26 October 1982, American National Standards Institute

Adopted for Mandatory Use 10 May 1984 Adopted U.S. Department of Defense (DoD)

ANSI/IEEE Std 91a-1991

Approved 27 June 1991 IEEE Standards Board

Approved 3 June 1994 American National Standards Institute

Adopted for Mandatory Use 1 July 1991 U.S. Department of Defense (DoD)

Abstract:

Graphic symbols for representing logic functions or physical devices capable of carrying out logic

functions are presented. Descriptions of logic functions, the graphic representation of these functions, and

examples of their applications are provided. The symbols are presented in the context of electrical

applications, but most may also be applied to nonelectrical systems (for example, pneumatic, hydraulic, or

mechanical). The supplement provided additional internationally approved graphic symbols and made

corrections as needed to IEEE Std 91-1984.

Keywords:

dependency notation, industry standards, logic diagrams, logic function, logic symbols, military

standards

The Institute of Electrical and Electronics Engineers, Inc.

345 East 47th Street, New York, NY 10017-2394, USA

No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the

prior written permission of the publisher.

ANSI/IEEE Std 91a-1991

Recognized as an

American National Standard (ANSI)

IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating Committees of

the IEEE Standards Board. Members of the committees serve voluntarily and without compensation. They are not

necessarily members of the Institute. The standards developed within IEEE represent a consensus of the broad

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Note: Attention is called to the possibility that implementation of this standard may require use of subject matter

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scope of those patents that are brought to its attention.

Introduction

(This introduction is not part of IEEE Std 91-1984, IEEE Standard Graphic Symbols for Logic Functions, or of IEEE Std 91a-1991,

Supplement to IEEE Std 91-1984.)

Two standards are included in this document: IEEE Std 91-1984, IEEE Standard Graphic Symbols for Logic

Functions, and IEEE Std 91a-1991, Supplement to IEEE Std 91-1984. In this edition (published in 1996), the two

standards have been merged to make it more convenient for the user.

The following sections of the original IEEE Std 91-1984 were extensively revised and replaced by IEEE Std 91a-

1991:

Pictorial Table of Contents

Table of Contents

Section 6: Symbols for Highly Complex Functions

Appendix A: Recommended Symbol Proportions

Appendix D: Integrated Circuits Used as Examples, Commercial Part Numbers vs. Symbol Numbers

Index

Numerous other revisions to IEEE Std 91-1984 in Sections 1 through 5 were made. The new Table of Contents and the

new Index indicate specifically where revisions were made. Further, change bars marked in the outside margins

indicate the locations of significant changes. Each standard has a unique foreword, included below.

IEEE Std 91-1984 foreword

This standard defines an international language by which it is possible to determine the functional behavior of a logic

circuit as described on a logic or circuit diagram with minimal reference to supporting documentation. Like natural

languages, the language set forth in this standard has been designed to allow a single concept to be expressed in one

of several different ways, according to the demands of a particular situation. Consequently, this standard does not

attempt, nor intend to establish single correct symbols for particular devices. A symbol appropriate for one application

of a device may not be appropriate for another.

The contributors to this standard represent a broad range of institutions, technologies, and documentation needs. They

include industrial, governmental, and educational organizations, producers and consumers of devices and equipment,

users and non-users of computer-aided design and drafting, and a considerable range of aesthetic preferences. That a

consensus of such diverse interests could be achieved in producing this standard is indicative of not only the utility of

the approach, but more importantly, of the increasing need among designers and maintainers of digital systems for a

common and more nearly complete symbolic language.

This revision is the result of a continuing activity to arrive at a useful notation to permit free interchange of

information on the design of binary-operated controls and systems. It is the latest step in a program that began in 1956

within the IEEE to develop a comprehensive single standard, consistent with ongoing developments in technology and

logic symbology, from several ad hoc, industry, military, and international standards. In 1960, an ad hoc group on

logic diagram graphic symbols was formed within the American National Standards Institute in order to develop a

draft American Standard. In 1961, this committee became a permanent subcommittee, Y32.14, of the Graphic

Symbols Committee, Y32, under the cosecretariat of ASME and IEEE. Its work resulted in the publication of IEEE

Std 91-1962 (ANSI Y32.14-1962 ), adopted in 1965 by the US Navy. The subcommittee was reorganized in 1969 to

prepare a new draft standard that would have broader acceptance and be in accord with the developments within the

International Electrotechnical Commission (IEC). ANSI/IEEE Std 91-1973 (Y32.14-1973) subsequently received

approval from ANSI, and the US Department of Defense, and was substantially compatible with IEC Pub 117-15,

Recommended Graphical Symbols: Binary Logic Elements. Since 1977 the preparing committee, IEEE SCC 11.9, has

worked closely with IEC Technical Committee 3 to prepare major new revisions of this standard and IEC Pub 617,

Part 12 (the successor to Pub 117, Part 15). The aim was for a US standard that would be mutually compatible with the

IEC standard, broadly acceptable, and that would provide notation or guidelines by which any SSI through VLSI

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